Power transmitter



Aug. 6, 1929. c. R. coLT POWER TRANSMITTER original Filed Feb. 2o, 192e 5 sheets-Sheet 2 Aug. 6, 1929. Q R COLT 1,723,468

POWER TRANSMITTER Original Filed Feb. 20, 1926 3 Sheets-Sheet 5 Patented Aug. 6', 1929.

UNITED STATES PATENT OFFICE.

CHARLES R. COLT, 0F BROOKLYN, 'NEW YORK, ASSIGNOR T0 WILLCOX & GIBBS SEW- ING MACHINE CO., OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

POWER TRANSMITTER.

Application filed February 20, 1926, Serial No. 89,819. Renewed August 6, 1928.

In the use of sewingmachines in garment manufacturing establishments it has been customary to arrange said machines in rows upon long tables known as powertables, each machine being belted to its own individual friction clutch power transmitter and the latter being mounted under the table and controlled by the operator of the machine through means such as a foot treadle, knee lever, or the like, to throw the friction clutch in or out to start and stop and control the running of the sewing machine at the will of the operator. The several power transmitters so used have received their power from a line shaft running lengthwise of the table, or more recently have each been combined with an individual motor, usually an electric motor, thus providing each sewing machine with its own individual combined motor and power transmitter, or what may be termed its unitary motor and power transmitter mechanism. It has valso become the practice to employ sectional power-tables with one sewing machine to each section and mounted on top thereof and the combined motor and friction clutch power transmitter unit which goes with that particular sewing machine mounted beneath the top of the table section, whereby one` section may be employed as an individual separate powertable, or any desirednumber 'of sections may be fitted and secured together end to end to thus constitute an extended multi-section table.

The present invention relates to power transmitters and especially has in view combined electric motor Aand friction clutch power transmitter units particularly adapted for use in conjunction with sewing machines under conditions such as above indicated.

It is common in friction clutch power transmitters, and particularly those used in conjunction with sewing machines to hold the clutch members in gripping engagement, while the7 are transmitting power, by continued pressure of a non-rotating part or element against a rotating part or element. This produces end thrust with resulting continued friction between rotating and nonrotating parts which friction must'be constantly overcome by the driving power while the transmitter is communicating motion to the machine with which it is associated. The additional load incident to such friction requires and consumes additional driving power over what would be sulicient if said friction were absent. Particularly in the case of a combined electric motor and power transmitter unit employed to drive a single sewing machine the elimination of such friction and consequent reduction of -load will not only effect a saving in power consumption, but will also make possible the use of less powerful and expensive motors.

Objects of the present invention are the elimination or approximate elimination of the aforesaid friction of the end thrust and pressure upon each other of relatively fixed and rotating parts resulting in said friction, the material saving in power consumed by the elimination of said friction, and the incidental possibility of using less powerful and expensive motors than required when said friction is present. A

A further object is the elimination of end thrust upon the armature shaft of the motor while the transmitter clutch is in action, whereby the armature may operate in its proper normal and natural position in its field free of end thrust tending to displace it and thereby reduce the power or ciiiciency of the motor. In other words, the object is to leave the armature sufficient freedom of endwise movement automatically properly to position itself or float in its eld unrestrained by end thrust upon its` shaft.

Further objects are the provision of a power transmitter in which both the driving and driven clutch elements are entirely supported by the driving shaft of the transmittel' and held in gripping engagement without imposing end thrust upon said shaft and without pressure of a fixed part against; a rotating part to hold the clutch elements in gripping engagement; in which while said elements are in clutching engagement they rotate with the shaft as a unit and without support other than that afforded by the shaft, thus minimizing bearings requiring alinement; in which the driven clutch element is positioned and gripped between two axially relatively movable and separate parts or sections of a two-part driven clutch element; in which said two parts of the driven clutch element are drawn together by' spring pressure to grip the driving element between them; in which the driving clutch element while rotatable with the driving'shaft is at the same time movable longimitter is fixedly associated with one part of a two-part driven clutch element and a brake member is fixedly associated with'the other part of said driven clutch element with said last-named part shiftable either to cause its brake member to cooperate with another brake member or to cause the twoparts of the driven clutch member to coact with the driving clutch member; in which the pulley of the transmitter may be quickly removed from its operative position through a slot or opening in thejcasing wall and if ldesired replaced by one of different size, all without disturbing other-parts of the mechanism; and in which wear of the clutch and .brake surfaces is compensated forv by the relative movement-of such-parts and no -adjustments for such wear required-all of these objects applying particularly where the driving shaft is the armature shaft of the motor of a combined motor and power transmitter unit.

Further' objects of the invention are the minimization of sidewisev stresses upon the motor shaftand its bearings and the obtainment of as near as possible a direct drive from the motor to the machine beingdriven; and to these ends locating the pulleyof the transmitter 'near the source of power byv shortening to an approximatev minimum the dlstance between`the vend of the motor and the pulley or the plane in which its belt operates and by locating said pulley lon the motor shaft between the motor and the clutch elements supported on 'said's'haftt Further objects of the invention are the provision of a combined motor and transmitter unit in which a sectional casing encloses the motor and transmitter including the rotary clutch elements and pulley of the latter with the provision of a slot or opening through the casing wall for a belt from said pulley; and the shortening of the length of the unit to an approximate minimum and otherwise forming it into a compact structure capable of being readily mounted under either a fiat-top or troughtop power-table or section of such a table and accommodatedby the space there :available with the pulley of the transmitter directly inthe vertical plane of the pulley of.

the sewing machine and without crowding thereof illustrated in the or encroaching upon the knee and legl space of the operator yor projecting beyond t e outlines of the table or table section.

The aforesaid and still otherobjects and advantages hereinafter explained or apparent from the detailed description and drawingsare attained by this invention and by the now preferred mechanical embodiment accompanying drawings, whereinl Fig. 1 is a part top plan view and part horizontal sectional view on line 1-1 of Fig. 2, showing the invention embodied in a combined motor and friction clutch power transvmitter mechanism or unit;

Fig. 2 is a front elevation with p arts of the mechanism shown in vertical section;

t Fig. 3 is a detail sectional view through a lof Fig. 2;

Fig. 7 is a vertical sectional detail view on line 7-7 of Fi 1;

Fig. 8 is a ont elevation and Fig. 9 is an, end elevation from the right of Fig.- 8 of a double-sided trough-top power-table of standard type for power sewing machines, showing a sewing machine mounted on the top of one side thereof with the unitary power mechanism of Figs. 1 and 2 mounted on the under side of the table in proper operative relation to the sewing machine; and

Fig. 10 is a detail view partly in section showing a modified arrangement in which the driving shaft of the transmitter may be one section of a shaft co-mmon to a number of transmitters.

The enclosing casing is made in four separable sections; beginning at the left, Figs. 1-

and 2, there is the motor cap section 20, then the motor frame section 217 then/the extension section 22, and finally thev transmitter cap section 23. The edge ofcap section 20;, at the open side of that section, accurately fits or telescopes into an interior groove 24 around the edge of the left-hand open end of section 21 and firmly seats against the-up- 120 right end wall of said groove, thereby insuring proper alignment in the fitting together of 4these sections. At its left-hand open end the extension section 22 similarly tits or telescopes into an interior groove 25 1.25

around the edge of the right-hand open end of section 21 and firmly seats against the up- -right end wall of said groove, thereby Iinsuring proper alignment in the fitting to poition of the housing or casing on line gether of these sections. Four bolts 26, Figs. 139

- bottom surface 1 and 3, each having a screw-head at one end and at its other end en aged. by an elongated screw-headed nut 2%, secure together the three casin sections 20, 21 and 22. These bolts will ie again referred to later. Op osing fiat surfaces, extending approximate y half-way around the open right-hand end of casing section 22 and the open end of cap section 23, accurately seat together as shown at 27 in Fig. 1. Two dowel pins 28, 28 determine the relative positioning in which these two casing sections 22 and 23 are secured together b three screws 29. Around the other half o their circumference or periphery the edgesV of these two casing sections 22 Vand 23 are recessed to stand apart from each other thus to form a slot or opening l30 through the wall of the comlplete casin to accommodate the passage of t e driving elt which runs from a pulley withinv the casing to. a pulley on the sewing machine or other mechanism to which ower is to be transmitted, this slotbeing a so of a size and location perinittin removal therethrough of said first-name pulley as well as the introduction therethrough of another pulley of different size to take.v the place of the one removed, 'as dpresently more fully explained. An upstan ing bracketextension 31 en motor casing section 21 has three seats 32 triang'ularl7 positioned with respect to each other an adapted to bear against the of a power-table.` Screwheaded bolts 33 pass downwardly through the table top, as shown in Fig. 2, and into interiorly screw-threaded openings in t-lie seats 32, thereby securing to the table the complete casing and the parts mounted therein and thereon and constituting the only means for supporting the same from said table. The use of three seats 32, or in other words what might be called a three-point contact of ,the bracket 31 with the surface of the table,has the advantage of assuring a firm engagement even if the surface of the table happens to be uneven. The e ectric'motor may be of well-known standard construction having a field 35 and an armature 36 both shown in dotted outline in Fig. 2. As shown in Figs. 2 and 3, the field 35 is held between nuts on the four reviously mentioned bolts 26. Said bolts eing screw-threaded throughout their length, the position of the nuts and hencethe position of the field may be adjusted lon itudinally of. the axis of the armature sha t. The motor has a specially constructed armature shaft 37 supported at one end of the motor in a bearing 38 in the cap section 20 of the casing and at the other end of the motor in a bearing 39 sup orted in a web or partition 40 preferabl ormed or cast as an integral part of t e casing section 22. The starting and stop ing switch of the motoris shown at 41 in ig. 2. An oil cup 45 to the top of bearing 38, a similar oil cup 46 connecting by pipe 47 to the top of bearing 39, depending oil cups 48 and 49 for said bearings,` respectively, and associated lubricant passages, all as best shown in Fig. 2, are of well-known standard construction. Oil cup 49 is put in place through an opening 50, Fig. 2, in the bottom wall of casing section 22, and may be removed through the same opening. The shaft 37 has slight endwise freedom of movement in bearings 38 and 39 to permit its armature 36 sufficient endwise movement to assume accurately and automatically its normal natural magnetic position relative to its field, or in other words, to permit the armature to center oi' position itself automatically and accurately relative to its field and thereby yield maximum power for current consumed. The ai'- mature shaft 37 extends to the right beyond bearing 39, this extension of the shaft including three stepped-down portions 55, 56 and 57 'of successively decreasing diameters and with a. screw-threaded part 58 between said portions 55 and 56. A drive pulley 60 having a peripheral belt groove 61 is rotatably supported on the shaft 37 by a ball-bearing of suitable preferably standard construction including inner and outer ball race sleeves 62 and 63 and interposed balls 64. Sleeve 62 fits the portion 55 of said shaft and is clamped against a shoulder about the shaft at the end of said portion 55 by a clamp ring 65 having an interior screw-thread engaging the threaded part 58 of the shaft. Sleeve 63 fits in a circular chamber or recess in pulley 60 and is clamped and held-therein by an exteriorly screw-threaded clamp ring 66 engaging a screw-thread around the interior of the recess in the pulley, said ring 66 bein thus. ositioned concentric to ring 65, as c early s own in Fig. 1. Drive pulleys of varying sizes are used in transmitters for sewing machines, the size used depending upon the particular conditions encoiintere such as the size of the ulley on the sewing machine, the speed desired, etc. The sizes of such drive pulleys commonly run from two and one-quarter inches uprto six inches. The drive pulley 60 represents one of the smallest diameter required. The drawings show mounted on and about the pulle 60 another pulley 70 of lar er diameter an for which may be substitute still other similarly constructed pulleys of either larger or smaller diameters. As best shown in Figs. 1 and 6, pulley 70 is formed in ltwo semi-circular sections or halves which fit together around pulle 60 and also closel fit in and between the side walls of a pei'ip ieral groove of said pulley 60, the -two sections of pulley 70 being secured together and clamped to the pulle 60 by two screws 71. The two sections' o pulley 70 may be introduced and secured in place, and also removed, through the slot 30 of the casing wall and without disassembling or disturbing other parts of the mechanism.

75 is what may be termed the drive pulley friction disk; it is located at the right side of said pulley 60 and is preferably an in-A tegral iianged part thereof. A circular concentric groove 76 in the right-hand fiat face of disk 75 receives a friction leather ring 77 held against longitudinal movement in said groove by pins such as 79, Fig. 1. 80 is a companion disk to disk 75 and is entirely supported by and from the latter on three headed studs 81, Figs. 1 and 7, symmetrically and equi-distantly spaced around and near the peripheries of disks 75 and 80 parallel to the axis thereof which axis coincides with the axis of the shaft 37.- Each stud 81 passes through an opening in disk 80 with a sliding lit and then into an open- (r in disk 75 where it is rigidly secured by 1n a get-screw 82. Around each stud 81 there is a coiled spring 83, or what may be called a clutch compression spring, bearing at one end against the head of the stud and at its other end against the flat surface of disk 80, the tension of these springs thus'constantly tendingto slide disk along its supporting studs 81 toward the companion disk 75. circular concentric groove in the lefthand flat face of disk 80 receives a friction 'leather ring 84 held against longitudinal movement 1n said groove by pins such as 85, leatherV ring 84 being thus positioned in opposition to leather ring 77. The two disks 75 and 80 constitute together a two-part driven clutch member with the drive pulley 60 (or 70 as the case may be) fixed to and rotatable therewith. is the driving clutch member in the form of a circular disk or wheel carried by shaft 37 and positioned between the disks 75 and 80 Which as before stated constitute the driven clutch member. Disk 90 has flattened surface portions at both sides thereof for making frictional clutching engagement with the leather rings 77 and I84C respectively. Disk 90 has in its hub three key-ways slidingly engaged by three keys 91 respectively, each key making tight engagement Iin a recess in the portion 564 of shaft 37. Disk 90 is thus rotated with shaft 37 while also free to shift or slide longitudinally along the portion 56 of said shaft.

The disk 80 of the two-part driven memgagement, with the driving and driven clutch members out of engagement, by means which will noW be described.

A hub-like projection or' boss 100 on the closed end of casing cap section 23 has therethrough a screw-threaded opening through which projects what may be termed a rotatable clutch control screw or member 101 threaded on its exterior for engagement with the threads of said opening. At its inner .cylindrical end said rotatable member 101 loosely passes through the hub portion of the combined clutch and brake membervand has at its extreme end a head or flange 102 loosely and movably fitting within the hub opening or chamber. A ball thrust-bearing 103 of standard construction encircles the Vinner end of rotatable,

clutch control member 101 between the head 102 thereof and a thrust-bearing washer 4101i .seated against a shoulder around the interior of the hub portion 95. The inner end of clutch control member 101 is axially holl lowed or recessed to receive abearing-sleeve 105 and the end portion 57 of the armature shaft which engages in said bearing-sleeve, the end of said shaft thus serving to rotatably support, center,.and guide the inner end of the rotatable clutch control .member 101. An axial lubricant passage through clutch control member 101, Fig. 1, leads from a grease cup 111 on the outer end of said member to the chamber at its inner end, and from the latter there is an axial passage 112 through shaft 37, shown in dotted lines in Fig. 1, from its right-hand end to transverse passages 113 leading to the ball-bearing for pulley 60. Other transverse lubricant passages 114 lead from passage 110 to the ball thrust-bearing 103. 120 is a lever arm having at one end a hub or boss 121 having an opening therethrough in which the outer cylindrical end of the rotatable clutch control member o'r screw 101 fits and is rigidly secured by two set-screws 122, Figs. 1 and 9. A coiled spring 123 (Fig. 4) encircles the projecting hub 100 on casing cap section 23 and also the adjacent hub 121 of said lever 120, the inner end of said spring at 124 being bent parallel to the axis of the spring and adapted to engage in any one of a series vof openings or sockets 125 in the end'wall of casing cap section 23, four of such socketst'being shown in the drawings, Figs. 1 and 5. The tension of spring 123 is determined by the position of the particularu socket 125 in which the end 124 of the spring is engaged. The other end of spring 125 is bent to form a hook 126 which is engaged around the upper edge of lever 12() adjacent hub 121 thereof. A link 127 connects the outer end of lever 120 to the upper end of a lever or rock arm 128 fastened at its other end by a set-screw 129 on the end of a rock shaft 130 where said shaft projects beyond one of its supporting bearings through the outer end of a bracket arm 131. Said bracket arm 131 depends in' a forwardly inclined direction from the end cap section 23 of the casing with which said bracket arm is preferably integrally cast. At its other end the shaft 130 projects through and has its bearing in a boss or enlargement 132 (Figs. 1 and 6) on the edge of casing section 22, a lever arm 133 being secured on the projecting end of said shaft by a set-screw not shown but similar to setscrew 129 at the vopposite end of the shaft.

From the outer end of lever arm 133 an adjustabl extensible connection rod 134 extends dbwnward to a treadle 135 shown in Figs. 8 and 9.

Figs. 8 and 9 show one section of a doublesided trough-top power-table of a standard construction with a sevvinor machine mounted on the top of one side thereof and a combined motor and power transmitter' unit of the present invention secured to the under side of said table in the manner heretofore described and illustrated in Fig. 2, a belt 140 being led from the drive pulley of the power transmitter to a pulley on the end of ythe sewing machine and such belt operating through the slot 30 provided in the side wall of the transmitter casing for that purpose as previously explained.

' In operation, electric current is turned on at the switch 41 (Fig. 2) and the motor thus set in operation to rotate the armature shaft 37. To transmit driving power from said shaft to the sewing machine the operative depresses treadle 135 andkeeps it depressed as long as it is desired to continue the running of the sewing machine. Depression of the treadle moves the connecting rod 134 and the lever arm 133 downward. This rotates rock shaft 130, thereby swinging the lever arm 128 at the other end of said shaft upward and forward toward the left inFigs, 5 and 9, and through the link connection 127 rotating the lever arm 120 and with it the clutch control screw 101 in a clockwise direction as viewed in Fig. 5, such movement being in opposition to the resisting tension of the coiled spring 123 and actin to increase the tension thereof. The clutc control member 101, by such rotation and its screwthreaded engagement through the casing.

wall, is move( inward to the position in which is 1s shown in Fig. 1, thereby releasing all pull or pressure of the head 102 of said member upon the balls of the thrustbearing 103 and thus leaving the disk 80 of the two-part driven clutch member free to be acted upon by the three coiled sprin 83. Said springs are thus enabled to shi the disk 80 toward thedisk 75, thereby firmly clamping or clutching between said disks the driving clutch member or disk 90 and also drawing the brake member 96 away from engagement with the other brake member 97. This position of the parts with the clutch thus in action and rotating the drive pulley 60, or 70, and the brake out of action, is shown in Fig. 1. To stop the machine the operative releases pressure on the treadle, whereupon the spring 123 reacts and by its expansion rotates the clutch control screw member 101 counter-clockwise. Such rotation also moves said clutch control member 101 endwise toward the right in Fig.1 by reason of its screw-threaded engagement through the casing boss or hub 100. By such rotary and endwise movement the clutch control member 101, and the head 102 thereof acting through the ball thrustbearing f103, slide the clutch disk 80 along its supporting studs 81 toward the right in Fig.` 1 in opposition to the pressure of springs` 83 and until the brake member 96 is firmly seated against the brake member 97, thereby arresting further rotation of disk 80 and of its companion disk 75 and thedrive pulley on the latter', and also stopping furtlier endwise and rotary movement of the clutch control member 101 by the spring 123. The aforesaid movement of disk 80 away from its companion disk 75 releases the clutching grip upon the interposed driving clutch member or disk 9 0, this occurring before the brake members come into engagement to arrest rotation of the two-part driven clutch member 75, 80 and associated drive pulley and machine to which the latter is belted. The driving clutch member or disk being thus released from the clutching engagement of the disks 7 5 and 80 continues to rotate idly until the operative again throws the clutch into action by depressing the treadle.

As thus appears, the spring means including springs 83 constantl tend to force the driving and driven c lutc members into clutching engagement and maintain that condition. But the force of said spring means is counteracted bythe means including spring 123 and the screw member 101 having head 102 at its inner end. But the last named counteracting means are under constant control of the operative through treadle 135 and its connections, whereby depression of said treadle renders said counteracting means inactive and leaves said spring means free to bring about clutching engagement of the driving and driven clutch mmbe1`s .AS ,thus .further appears, the opllU erative by depression'of the treadle does not power which itself presses the clutch appl bers into engagement, as 1s usually the mem case in sewing machine power transmitter cluding springs 83) to apply that power.

Hence strain of excessive power applied by the operative does not fall upon the clutch' members, but upon other parts of the mechanism where it is less likely to cause damage.

lf not desired to employ an individual motor to each transmitter, but to drive a number of sewing machines from a common source of power distributed by line shaft and belting for example, a suitably beltdriven pulley could be substituted for the electric motor shown in the accompanylng drawings said pulley being fixed to the shaft 37 to continuously rotate the same. Or the shaft 37 may be extended entirely through the clutch control screw or member 10P in the manner illustrated in Fig. 10, and be provided at both ends with couplers 15() joining it to other shaft sections, a number of such coupled together sections constituting a' line shaft applying to the desired number of individual transmitters.

While it will be readily understood that the mechanism described in detail realizes the object-s and advantages hereinbefore set forth, reference is here again made to the followingv characteristics thereof: Power transmitters of the type under consideration commonly employ two shafts or shaft sections for the clutch elements respectively,-

these shafts an/dtheir bearings requiring alinement. ln the present structure lonly one shaft or shaft section is em loyed, that is to say, the disk or part of) the driven clutch member is rotatably supported on armature shaft 37 and in turn supports the other disk or part of said clutch member by the .studs 81; the driving clutch element is also carried by said shaft and all of these parts as Well as the pulley rotate with said shaft when the clutch is in The pulley 60, or 70, of the transmitter is located on the shaft immediately adjacent the motor and between it and the clutch elements on said shaft, thus approximating a direct drive from the motor to the sewing machine. The position of the pulley 60, or 70, remains constant whether rotating or not; that is to say, it is not shifted when the transmitted clutch is thrown in and out. Strain and wear upon the belt and other parts are thus avolde When the clutch parts are in grip and rotating with the motor shaft, said shaft is entirely free of end thrust and there is no condition of a stationary part pressing against a rotating part with'consequent frictien and resulting load upon the motor. By such elimination of end thrust and friction and reduction of load, a substantial and mames large saving in power consumption is effected and it is possible to employ less powerful and less expensive motors in combined motor and transmitter units. 'Fui-thermom, the armature is free to operate in its natural and proper position in its field and the motor generally to function with maximum efliciency.

As will be apparent, the invention is not restricted to the particular structural embodiment thereof illustrated and described, but on the contrary issusceptible of a variety of embodiments all within the definition of the invention given in the claims which follow.

What is claimed as new is:

l. ln a power transmitter, the combination of a driving shaft; a driving clutch element actuated by said shaft; a cooperating driven clutch element; means pressing said elements into power transmitting' clutching engagement with each other without creating end friction to be overcome by the driving power of said shaft while the transmitter is acting to transmit power; means causing said clutch elements to release their power transmitting clutching engagement with each other and therby render the transmitter inactive and means under control of an operative for rendering said releasing means ineffective.

y 2. In a power transmitter, the combination of a driving shaft; a driving clutch element actuated by said shaft; a cooperating driven clutchl element; means pressing said lements into power transmitting clutching engagement with each other without pressure of a non-rotating part against a rotating part to maintain such engagement while transmitting power; means for causing said clutch elements to release their power trans'- mitting clutching lengagement with each other and thereby render the transmitter inactive and means under control of an operative for rendering said releasing means ineffective.H

3. In a power transmitter, the combination of a driving shaft; a driving clutch element actuated by said shaft; a cooperating driven clutch element; means pressing said clutch elements into power transmitting clutching engagement with each other without pressure of a non-rotating part against a rotating part vto maintain such engagement While transmitting power and without creating end friction to be overcome bythe driving power of the shaft while the clutch elements are in engagement and transmitting power; meansV for causing said clutch elements to release. their power transmitting clutching engagement with each other and thereby render the'transmitter inactive and means under control of an operative for rendering said releasing means ineffective.

e. ln a power transmitter, Athe combinaelement carried. b

tion of a driving Shaft; a driving clutch element actuated b said shaft; a cooperating driven clutch e ement; spring means carried by one of said elements and acting upon the other element to press the two elements into power transmitting clutching engagement; means acting counter to said spring means to cause said clutch elements to release their power transmitting engagement and thereby render the transinitter'inactive and means under control of an operative for rendering said releasing means ineffective.

5. In a power transmitter, the combination of a driving shaft; a driving clutch element rotatable with said shaft; a cooperating driven clutch element; spring means carried by said driven clutch element and acting upon said driving clutch element to move it axially of said shaft and press it into power transmitting engagement with the driven clutch element; means acting counter to said spring means to cause said clutch elements to release their power transmitting engagement and thereby render the transmitter inactive and means under control of an operative for rendering said releasing means ineffective.

6. In a power transmitter, the combination of a driving shaft; a driving clutch element carried by and rotatable with said shaft; a cooperating driven clutch element carried by said shaft; spring means carried by one of said elements and acting on the other element to relatively move and press said two clutch elements into power transmitting clutching engagement; means actin counter to said spring means to cause said c utch elements to release their power transmitting engagement and thereby render the transmitter inactive and means under control of an operative for rendering` said releasing means ineffective.

7. In a power transmitter, the combination of a driving shaft; a driving clutch and rotatable with said shaft; accoperatmg driven clutch Ielement part journaled and supported on said shaft but fixed against movement axiallythereof a pulley fixedly connected to said driven clutch element part to rotate therewith; spring means carried by said driven lclutch element part and acting to press it into power transmitting engagement with the driven clutch element pait; and means causing release of said power transmitting engagement of said elements and thereby rendering the transmitter inactive.

8. In a power transmitter, the combination ofa driving shaft; a driving clutch element carried by and rotatable with said shaft; a cooperating driven clutch element including two relatively movable parts; a pulley fixed to one ait of said driven clutch member to rotate t erewith; a brake including two cooperating members one of which clutch member; spring means carried by said driven clutch element and acting to press the driving and driven clutch elements into power transmitting clutching engagement with each other; and means causing said clutch elements to release their said power transmitting clutching engagement and the brake member on one part of the driven clutch .element to engage its cooperating brake member.

9. In a power transmitter, the combination of a driving shaft; a driving clutch element carried by and rotatable with said shaft; a cooperating driven clutch element including relatively movable parts one fixed against `movement axially of said shaft and the other movable axiall of said shaft; a pulley fixed to one of sai arts to rotate therewith; a brake including two cooperating members adapted to be moved into and out of engagement with each other one of said 'members being carried by said part of the drive clutch element which has movement axially of the driving shaft; spring means carried by said driven clutch element and acting on said driving clutch element to press the two elements into power transmitting clutching engagement with each other; and means causing said clutch elements to release their said power transmitting clutching engagement and moving the axially movable part of the driven element to engage thebrake member thereof with said cooperating brake member.

10. In a combined motor and ower transmitter, the combination of an e ectric motor and its armature shaft; a driving clutch element actuated by said shaft; a cooperating driven clutch element; means pressing said elements into power transmitting clutching engagement with each other without creating end thrust to be overcome by the driving power of said shaft while the transmitter is acting to transmit power; and means causing said clutch elements to release their power transmitting clutching engagement with each other and thereby render the transmitter inactive.

11. In a combined motor and power transmitter, the combination of an electric motor and its armature shaft; a driving clutch ele- 'ment actuated by said shaft; a cooperating driven clutch element; means pressingsaid elements into power transmitting clutching engagement with each other without pressure of a non-rotating part against a rotating part te maintain such engagement while transmitting power; and means causing said clutch elements to release their power transmtting clutching engagement with each other and thereby render the transmitter inactive.

12. In a combined motor and power transmitter, the-combination of an electric motor is carried by the other part of said driven and its armature shaft; a driving clutch element actuated by said shaft; a cooperating driven clutch element; means pressing said clutch elements into power transmitting clutching engagement with each other without pressure of a non-rotating part against .a rotating part to maintain such engagement while transmitting power and without creat- `ing end thrust to be overcome by the driving driven clutch element; spring means carried by one' of said elements and acting upon the other element to press the two elements into power transmitting clutching engagement; means acting counter to said spring means to cause said clutch elements to release their power transmitting engagement and thereby render the transmitter inactive and means under control of an operative for rendering said counteracting releasing means ineffective.

14. In a combined motor and power transmitter, the combination of an electric motor and its armature shaft; a driving clutch element carried by and rotatable with said shaft; a cooperating driven clutch element; spring means carried by one of said elements and acting on the other element to relatively move and press said two clutch elements into power transmitting clutching engagement; means acting counter to said spring means to cause said clutch elements to release their power transmitting engagement and thereby render the transmitter inactive and means under control of an operative for rendering said counteracting releasing means ineective. v

15. In a combined motor and ower transmitter,-the` combination of an e ectric motor and its armature shaft; a driving clutch element carried by and rotatable with said shaft; a cooperating driven clutch element including relatively movable. parts one fixed against movement axially of said shaftand the other movable axially of said shaft; a pulley fixed to one of said `parts to rotate therewith; a brake including two cooperating members adapted to be moved into and out of engagement with each other one of said members being carried by said part of the drive clutch element which has movement axially of the driving shaft; spring means carried' by said driven clutch element and acting to press the same and the driving clutch element into power transmitting clutching engagement with each other; and means causing said clutch elements to release Maaate their. said power transmitting clutching engagement and moving the axially movable v part of the driven element to engage the brake member thereof with said cooperating brake member.

16. In a combined motor and power transmitter, the combination of an electric motor and its armature shaft; a driving element of a friction clutch rotated by said shaft; a cooperating driven elelnent of the friction clutch; means pressing said clutch elements into power transmitting frictional engagement with each other without creating end thrust to be overcome by the driving power of said shaft while the transmitter is acting to transmit*l power; and means causing said clutch elements to release their power transmitting frictional engagement with each other and thereby render the transmitter inactive.

17. In a combined motor and power transmitter, the combination of an electric motor and its armature shaft; a driving element of a friction clutch rotated bysaid shaft; a cooperating driven elementy of the friction clutch; means pressing said clutch element-s into power transmitting frictional engagement with each other without pressure of a non-rotating part against a rotating part to maintain such engagement while transmitting power; vand means causing said clutch elements to release their power transmitting frictional engagement withV each other and thereby'render the transmitter inactive.

e 18. In a combined motor and power transmitter, the combination of anv electric motor and its armature shaft; a driving element of a friction clutch rotated by said shaft; a cooperating driven element of the 'friction clutch; means pressing said clutch elements into power transmitting frictional engagement with each other without creating end thrust upon said shaft while the transmitter is acting to transmit power; and means causing said clutch elements to release their power transmitting frictional engagement with each other and thereby render the transmitter inactive.

19. In a combined motor and power -transmitter, the combination of an electric motor and its armature shaft; a driving element of a friction clutch carried by and rotatable with said shaft; a cooperating driven element of said friction clutch; spring means carried by one of said clutch elements and acting to press the two clutch elements into frictional clutching engagement to transmit power; and means causing said elements to release their power transmitting clutching engagement with each other and thereby render the transmitter inactive.

20. In a combined motor and power transmltter, the combination of an electric motor and its armature shaft; a driving element of a fmctlon clutch carried by and rotatable with said shaft; a cooperating driven element of said friction clutch; spring means carried by one of said clutch elements and acting to press the two clutch elements into frictional clutching engagement to transmit power; means'causing said elements to release their power transmitter clutching engagement with each other and thereby render the transmitter inactive; a pulley rotatable with said driven clutch element; and abrake member carried by said clutch element and adapted to be engaged with a cooperating brake member when the clutch elements are disengaged.

21. In a combined motor and power transmitter, the combination of an electric motor and its armature shaft; a driven clutch element carried by said shaft; a driving clutch element carried by and rotatable'with said.

shaft and movable axially thereof into and out of engagement With said driven' clutch element; spring means carried by said driven clutch element and acting upon said driving clutch element to move it axially of said shaft and press it into power transmitting clutching engagement with said driven clutch element; and means acting counter to said spring means to cause said clutch elements to release their power transmitting engagement and thereby render the transmitter inactive.

22. In a power transmitter, the combination of a driving shaft; a` driven clutch element carried b said shaft; a driving clutch element carrie by and rotatable with said shaft and movable axially thereof into and out of engagement with said driven clutch element; spring means carried by said driven clutch element and acting upon said driving clutch element to move it axially vof said shaft and press it into power transmitting clutching engagement with said driven clutch element; and means acti'ng"- counter to said spring means to cause said clutch elements to release their power transmitting engagement and'thereby render the transmitter inactive.

23. In a power transmitter, the combination of a driving shaft; a driving friction clutch element on and connected to said shaft to rotate therewith; a driven friction clutch element including two relatively movable rotatable parts between which the driving element is positioned and adapted to be gripped; spring means carried by said driven element and acting to press the two parts thereof towards each othergand into clutching engagement with the interposed.

driving element; and means acting counter to said spring means to move said two parts of the driven element relatively away from each other and thereby release the clutching engagement of the two clutch elements.l

24. In a power transmitter, the combination of a driving shaft; a driving friction -clutch element on and connecte between said parts of the driven clutch element; and means acting to move said axially movable part of the driven element away from the other part thereof in opposition to the tension of said spring means and thereb release the clutch.

25. n a power transmitter, the combination of a driving shaft; a drivin friction to said shaft to rotate therewith; a driven friction clutch element including two rotatable parts between which the driving clutch element is positioned and adapted to be gripped, one

of said part-s 'being fixed against axial movement and the other part being axially movable; spring means carried by said driven element and acting to move said axially movable part thereof toward the other part and clutching the drivin clutch element between said parts of the riven clutch element; means acting to move -said axially movable part of the driven element away from the other part thereof in opposition to the tension of said spring means `and therebyrelease the clutch; and a pulley on said part of the driven clutch element which is fixed against axial movement.

26. In a power transmitter, the combination of a driving shaft; a driving friction clutch element on and connected to said shaft to rotate therewith; a driven friction clutch element including two rotatable parts between which the driving clutch element is positioned and ada ted to be gripped, one` of said parts being xed against axial movement and the other part being axially movable; spring means carried by said driven element and acting to move said axially movable part thereof toward the other part and clutching the drivingclutch element between said parts of the driven clutch element; means acting to move said axially movable part of the driven element away from the other part thereof in opposition to the tension of said spring means and thereby release the clutch; and a brake having one member thereof on said axially movable part of the driven clutch member adapted1 to be engaged with acooperating brake member by the aforesaid axial movement of said part of the driven clutch member to its clutch releasing position.

27. In a combined motor andy power transmitter, the combination of an electric motor and its armature shaft; a friction clutch including a driving clutch element on said cluding a driving element mounted on saidy shaft to rotate therewith and a cooperating driven element supported by sald shaft and including two relatively movable parts with vsaid driving clutch element interposed between thein; means for causing said parts to be relatively moved toward and from each other into and out of clutching engagement with the interposed driving clutch element; and a driven pulley positloned about said shaft between the motor and the clutch elements and fixed to the driven clutch element to rotate therewith.

29. In a combined motor and power transmitter, the combination of an electric motor and its armature shaft; a friction clutch including a driving element mounted on s aid shaft to rotate therewith and a cooperatlng driven element supported by said shaft and including two relatively movable parts with said driving clutch element interposed between them; means for causing said parts to be relatively moved toward and from each other into and out of clutching engagement with the interposed driving clutch element; a driven pulley positioned about said shaft between the motor and the clutch elements and fixed to one of said parts of the driven clutch element to rotate therewith; and cooperating brake members one of which is carried by said other part of the driven clutch member to rotate therewith.

30. In a power transmitter, the combination of an enclosing casing; a driving shaft in a chamber within said casing; a driving friction clutch element on and rotating with said shaft in said chamber; a cooperating driven friction clutch element in said chamber; .a driven pulley rotatable with said driven clutch element within said chamber; and means controlled from the exterior of said chamber for effecting operative engagement and disengagement of said clutch elements.

3l. In a combined motor and power transmitter, the combination of an enclosin casing; an electric motor in one end o said casing with its armature shaft extended toward and into the other end of the casing; driving and driven friction clutch elements and a pulley all located in the other end of the casing with the driving clutch element actuated by said armature shaft at the extended end of the latter and the pulley rotatable with the driven clutch element; and means controlled from the exterior of said casing for effecting operative engagement and disengagement of said clutch'elements.

32. In a combined motor and power transmitter, the combination of an enclosing casing including a plurality of sections secured together end to end; an/electric motor in one end of said casing with its armature shaft extended toward and into the other end of the casing; driving and driven friction clutch elements and a driven pulley all associated with said extended portion of the armature shaft and located in said other end of the casing; and means controlled from the exterior of said casing for effecting operative engagement and disengagement of said clutch elements.

33. In a power transmitter, the combination of a shaft; a friction clutch including rotatable driving and driven elements adapted` to be relatively moved into and out of frictional clutching engagement with each other; a pulley formed of a plurality of sections adapted Vto fit together and be assembled around a part on one of said clutch elements; and means securing said pulley sections 'in their assembled relationship on said clutch element and whereby the pulley may be fastened in place or removed without disturbing the assembled relationship of other parts of the mechanism.

34. In a power transmitter, the combination with a rotatable part thereof; of a pulley adapted to be ixed to and rotated with said rotatable part and formed of a plurality of sections adapted to fit together and be assembled around a portion of said rotatable part; and means accessible at the periphery of the pulley and fastening the sections thereof together whereby the pulley may be applied and fastened in place or released and removed without disturbing the assembled relationship of other parts of the mechanism.

35. In a power transmitter, the combination of an enclosing casing; a driving shaft; driving and driven friction clutch elements associated with said shaft within the casing;

and a pulley within said casing and secured to one of said clutch elements to rotate therewith said pulley being so constructed and positioned with relation to a slot or opening in the side wall of the casing as to be detachable from the clutch part with which it is rotatable and removable through said opening in the side wall of the casing without disturbing or disassemblig other parts of the mechanism.

36. In a power transmitter, the combination with a rotatable part thereof, of a pulley adapted to be fixed to and rotate with said rotatable part and formed of a plurality of sections adapted to fit together andA be assembled around a portion of said rotatable part; means accessible at the periphery of the pulley for fastenin' the sections thereof together; and an enc osing casing having in its wall a slot or opening through which access may be had to said fastening means to apply or release the same and through which opening the pulley sections may be either introduced and assembled in place, or be removed, all without disturbing the assembled relationship of other parts of the mechanism.

37. In a power transmitter, the combination with a rotatable part thereof, of a pulley secured to said rotatable art to rotate therewith; and a larger pulley formed in sections adapted to fit together and be assembled and secured around said first named pulley when it is desired to usesaid .larger pulley.

38. In a power transmitter, the combination of a'driving shaft, a driving friction clutch element on and connected to said shaft to rotate therewith; a driven friction clutch element including two relatively mvable rotatable parts between which the driving element is positioned and adapted to be gripped; spring means carried by said driven element and acting to press the two parts thereof towards each other and into clutching engagement with the interposed driving element; and means'acting counter to said spring means to move said two parts of the driven element relatively away from each other and thereby release the clutching -engagement of the two clutch elements.

In testimony whereof I have signed this specification.

` CHARLES R. COLT. 

